Two-weave bobby



Dec. 3, 1929. 1 A. A. GORDON Two-WEAVE DOBBY Filed Jan. 16. 1928 2 Sheets-Sheet 2 Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE ALBERT A. GORDON, 0F WORCESTER, MASSACHUSETTS, ASSIGNOR T0 CROMPTON & KNOWLES LOOM Vi/'OR-KS, OF VORCESTER, MASSACHUSETTS, A CORPORATION 0F MASSACHUSETTS Application led January 1G, 1928.

T his invention relates to improvements in dobbies capable of producing two different weaves and it is the general object otl the invention to provide a dobby having an auxiliary pattern cylinder and a set ot' indicating' tingers thereior the pivots ot' which are movable so that different portions of the tinmay be opposite the pattern cylinder at ditl'erent times.

The invention set forth herein is more particularly related to the :form oi? so-called name dobby set forth in my prior Patent No. 1.060.9T. A dobby ot this type may be used iter the weaving ot naines or other identification marks in the Solv-ages olE cloth, and is usually mounted on the arches of the loom to act in addition to the ordinary sheddingi mechanism to control only a few of the warp threads. The devices set forth herein, however, need not necessarily be limited to a name dobby, but may be used to control larger groups of warp threads.

The dobby shown in said patent has been provided with an auxiliary upper cylinder as set toi-th in my co-pcnding application Se rial llo.v 203,417, the cylinder moving about a fixed axis and the pattern mechanism being necessarily provided with :i blank space to be presented opposite the controlled lingers when the auxiliary cylinder is idle and the main cylinder is in operation. In another later iied co-pending application Serial No. 937,0Tl l have shown means for raising the auxiliary cylinder so that it is not necessary to provide the pattern surface with a blank space. The forms of mechanism shown in said applications have worked successfully but the necessity for raising 'the auxiliary cylinder introduces Certain objections which are intended to be corrected by the invention set forth herein. it is an im* portant object ot my present invention to keep the axis ot' the auxiliary cylinders substantially fixed and to provide a set of lingers having surfaces ot two ditl'erent heights, the higher surface being' positioned to cooperate with the pattern surface when the fingers are in one position and the low surace beingopposite but out of the range ol the pattern surface when the lingers are in TWO-WEAVE DOBBY Serial No. 246,953.

another position. The lingers 'for the auxiliary cylinder are pivoted about a rod or shaft which is movable under control of the main pattern mechanism. The axis of the auxiliary pattern surface may be substantially stationary but the pattern surface need not be provided with a blank space, inasmuch as the low portions ot' the indicator levers aC- complish the same result as the blank space in the first of the aforesaid applications.

It is a lurther object of my present invention to provide a pair ot alternately operative pattern surfaces made up of bars which present a continuous pattern without blank spaces, said cylinders moving about fixed axes and one ot the cylinders cooperating; with levers moving about a fixed center while the other pattern surface cooperates with the levers pivoting about a movable center` lith these and other objects in View which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings wherein one iorm ot' my invention is shown,

Fig. l is a side elevation of a dobby mechanis-m having my invention applied thereto, the parts beingr in a position to permit control ot the warp by the upper or auxiliary cylinder,

Fig. 2 is a iop plan taken in the direction of arrow 2, Fig'. l showing` the left hand portion ot' the dobby,

Fig'. 3 is a detail Yliront elevation taken in the direction ot arrow 3, Fig. l,

Fig. 4f is a detail vertical section on line Lllfl ot ll 3 showing the lower end ot' the pawl tor the upper cylinder, and

Fig. 5 is a perspective view of one ot' the indicating lingers tor the top cylinder.

lieterrinjr to the drawings I have shown a loom arch l() on which is mounted the dobby 'termina' the subject matter of the present invention. Said dobby is provided with a pair oi' side plates ll in which is mounted for periodic angular rotation a main pattern cyliiuler 12 having, a pattern chain 13. A ratchet wheel la secured to the shaft 15 on which the cylinder l2 is mounted so that said ratchet Cil vheel and cylinder move together. An actuating pull pawl 16 cooperates with the ratchet wheel 14 to give the cylinder periodic angular movements to bring the bars 13 of the main pattern chain under the dobby fingers 17 one at a time. The fingers are pivoted on a rod 18 which extends between the dobby plates 11 and certain of said fingers have upwardly extending tails 18EL while others have horizontally and rearwardly extending tails 19. Upright wires 20 and 21 cooperate, respectively, with the tails 18a and 19 and said wires may be suitably guided as by racks 22 and 23, respectively, supported by the dobby plates 11. The upper ends of the wires 21 are bent back on themselves as at 24 and extend downwardly through the upper comb 22 while the upper ends of the wires 20 entend through said comb and project thereabove a slight distance.

Each harnessjack 25 is pivoted to a lever 26 mounted pivotally on a pin 27 held by the plates of the dobby. A lixed pin 23 engages forward extension 29 of the jacks to cause upward movement of the latter when the levers 26 move in a clockwise direction around pin 27. 1n order to produce this movement of the levers 26 each of the latter has connected thereto as at 30 a dobby back lever 31 extending on both sides of the pivot 30. Each back `lever has connected thereto an upper hook 32 and a lower hook 33. Said hooks cooperate with knives not shown herein but set forth in my aforesaid application Serial No. 203,417. rllhe hooks are raised and lowered whenever the corresponding lingers or indicating levers 17 are lowered or raised, respectively, in the manner set forth in my copending application Serial lilo. 237,071.

A multiplying unit M consisting of two chains and 3:3 of diilerent lengths may be employed if desired, each chain having a plurality of high links 36 and one of the low links indicated at 37 in Fig. 1. The multiplying unit need not necessarily be employed but is shown herein to indicate a means for reeping the upper cylinder to be described hereinafter idle for a large number of picks without an excessive length of chain on the main cylinder 13.

A rocker shaft 38 is given periodic oscillations by mechanism not shown, moving to the right on one piek and to the left on the next pick, etc. Secured to said shaft is an arm 39 to which the pawl 16 is pivotally connected as at 40. Another pawl 41 is also connected to said arm 39 and cooperates with the ratchet 42 which moves with the chains 34 and 35 causing the latter to have a step by step movement. A lever 43 is pivoted on the rod 18 and has a shoe 44 to cooperate with the links of the chains 34 and 35. A spring 45 connected to the lever 43 and one dobby plate tends to lhold said shoe against the chains. An upwardly extending arm 46 has adjustably held memes@ therein a pin 47 which cooperates with the pawl 16 and holds the latte1 in the inoperative position shown in Fig. 1 when a high link 36 on either of the chains 34 or 35 lies under the shoe 44.

pstanding horns 49 supportan upper cylinder 50 having a series of pattern chain bars el mounted thereon which provide the auxiliary pattern surface referred to herein. A rachet wheel 52 is secured to the shaft 53 on whi h the cylinder 50 is secured and the upwardly extending pawl 54 cooperates with said ratchet 52 when the main pattern surface idle. The control for the pawl 54 includes a depending arm 55 preferably cast integral with the pawl and movable loosely around the stud 40. The lower end of said arm is provided with a c --i face 56 which terminates in a relatively low face 57 on the upper side thereof and in a relatively hi surface 58 on the lower side thereof. An extension 59 formed as part of a lever 6() pivoted on rod 18 cooperates with the lower end of arm 55 to vcontrol pawl 54. As shown in ig. 4 when M ne lever 60 is in the position shown in Fig. 1 extension 59 will be up and opposite the relatively low s face 57 so that spring 60a interposed between the pawl 54 and one of the (lobby ilates will hold sai d pawl in operative position with r peet to the ratchet wheel 52. A finger 4S carrier. hy the lever 60 engages the right hand side o' the lower end of pawl 41 as shown in Fig. 1 auf. acts to hold said pawl out of engagement with the ratchet wheel 42 when the right hand end of lever 60 is down.

Under normal conditions, with the main cylinder operative, two low links 37 will be under shoe 44 and pawl 16 will engage ratchet 14 to give cylinder 12 a step by step movement. 'lhe foot 61 on the right end of the lever 60 as viewed in Fig. 1 will be down and linger 48 will hold pawl 41 inoperative and extension 59 will be opposite the high surface 58 at the time pawl 54 has a down motion, so that the said pawl 54 will miss the ratchet 52. As the main cylinder continues to rotate a peg 62 will eventually arrive under foot 61 to lift the lever 60 to the position shown in F ig. 1. lfinger 4S will thereupon move to the right to permit pawl 4 1 to turn the multiplier chains and extension 59 will rise to a position opposite the low surface 57 to permit pawl 54 to become operatively related to the auxiliary cylinder. On the next down stroke of pawl 41 high links. 36 will move under shoe 44 to cause pin 47 to render pawl 16 inoperative with respect to the main cylinder. 'lhe upper cylinder will remain active until the low links 37 again arrive under shoe 44, at which time the pawl 16 will move peg 62 away from foot 61 and lever 60 will have a righthand oscillation to cause cessation of movement of the multiplying unit and the auxiliary cylinder. n interposed between lever 43 and finger 48 tends to hold the parts in the position shown in Fig. l. The matter thus 'far described is set forth to show how my in- Vention described hereinafter may be utilized but forms no part of my present invention and may be substantially the same as socalled name dobbies now in use.

In carrying my improvements into effect I provide improved and simplified means for communicating indications from the upper or auxiliary pattern chain to the hooks 32 and 33. The rear end or" said lever 60 is slotted as at 63 to receive a stud Get having pivotal connection with the lower end of link 65. The slot affords adjustment of the stud so that the movement imparted to the link may be varied. The upper end of said link is pivoted as at 66 to one arm of the lever 6T pivoted on a stud 68 which is fast with respect to one of the plates of the dobby. The upper end of said lever G7 has secured therein a rod 69 which extends across the dobby as shown in Fig. 2 and has pivoted thereto a series of depressor levers 70. There will be one lever 70 for each of the wires 2() and 2i and said levers will rest en the upper ends of the wires as indicated in Fig. l, being light enough to be overbalanced by the fingers 17.

An important part of my present invention relates to the control of said depressor levers and as shown more particularly in Fig. each of said levers is provided with a relatively high chain engaging surface 7l and a low surface 72 which will ordinarily be out of reach of the dobby pegs 73 carried by the links 5l when the parts are in such a position as to render the upper cylinder inactive.

In the operation of the device it may be assumed that the parts are in the position shown in Fig. l with the lower cylinder inactive and the upper cylinder receiving a pei riodic angular movement to bring a new bar 5l immediately over the depressor lever T() at periodic intervals of' the loom, such for instance as every second pick when the dobby is made as a so-called double index dobby as set forth herein. The relatively high surfaces 7l of the depressor levers will be in position to be engaged by the dobby pegs 7? and certain of the levers 70 will be depressed according to the demands of the pattern to lower the corresponding wires and 2l. This will effect control of th-e hooks 32 and 33 so that the harness jacks or levers may receive movements corresponding to the demands of the pattern. Then the parts are in the position shown in Fig. l the peg G2 will be under the foot 6l of the lever G0 and will remain in this position for as many picks as the upper cylinder is to be active. The period of action on the part of the auxiliary cylinder will be determined by the length of the chains 34 and 35 and when two low links 37 appear under the shoe 44 the pawl 16 will act to move the peg 62 from under the foot 61, as previously described, at which time spring interposed between one of the dobby plates and the lever G7 will move the latter to the left to the dotted line position indicated in Fig. l. In this position the low areas 72 of the levers 70 will be under the auxiliary pattern surface and the wires 2O and 2l will therefore not be controlled by the auxiliary pattern; The chain on the main cylinder will be so pegged as to lift the foot Gl whenever it is desired to throw the depresser levers into operative position.

From the foregoing it will be seen that l have provided a two weave dobby for pattern mechanism wherein two cylinders each bearing an independent pattern chain are alternately rendered operative, each cylinder moving about a fixed axis and that the main cylinder cooperates with dobby fingers of the usual form which swing about a fixed center while the auxiliary cylinder cooperates with a set of depressor levers which swing around a movable pivot the location of which is determined by the main pattern chain. lt will further be seen that the depressor levers are provided with high and low areas and that when the low areas are opposite the auxiliary pattern surface the latter will have no effect on the hooks of the dobby. It will also be seen that because of the formation of the depressor levers 70 it will not be necessary to leave a blank space on one of the bars ofthe auxiliary pattern chain but that said pattern may be continuous without blank spaces.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and l do not wish to be liniited to the details herein disclosed, but what I claim is:

l. In a dobby having a main pattern surface and an auxiliary pattern surface each movable about a fixed axis and having dobby fingers to be controlled directly by the main pattern surface, a set of auxiliary fingers for the auxiliary pattern surface, means defining a pivot for said auxiliary fingers, intermediate elements between the auxiliary fingers and the dobby fingers whereby movement of an auxiliary finger will cause movement of the corresponding dobby finger. and means to move the pivot for said auxiliary fingers relatively to the axis of the auxiliary pattern surface to move said auxiliary fingers into and out of operative position with respect to the auxiliary pattern surface.

2. In a dobby having a main pattern surface and an auxiliary pattern surface each movable about a fixed axis and having dobby fingers to be controlled directly by the main pattern surface, a set of auxiliary fingers for the auxiliary pattern surface, means defining a. pivot for said auxiliary fingers, intermediate elements between the auxiliary fingers 

